<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title></title>
    <style>
        ul,li{padding: 0;margin: 0; list-style: none;}
.adver{margin: 0 auto; width: 700px; overflow: hidden; height: 454px; position: relative; background: url("../images/adver01.jpg");}
ul{position: absolute; bottom:10px; z-index: 100; width: 100%; text-align: center;}
ul li{display: inline-block; font-size: 10px; line-height: 20px; font-family: "微软雅黑"; margin: 0 1px; width: 20px; height: 20px; border-radius: 50%; background: #333333; text-align: center; color: #ffffff;}
.arrowLeft,.arrowRight{
    position: absolute;
    width: 30px;
    background:rgba(0,0,0,0.2);
    height: 50px;
    line-height: 50px;
    text-align: center;
    top:200px;
    z-index: 150;
    font-family: "微软雅黑";
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    display: none;
}
.arrowLeft{left: 10px;}
.arrowRight{right: 10px;}
li:nth-of-type(1){
    background: orange;
}
.adver{
    transition:all 3s;
}
    </style>
</head>
<div class="adver">
    <ul>
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
        <li>6</li>
    </ul>
    <div class="arrowLeft"><</div><div class="arrowRight">></div>
</div>
<script src="../lib/jquery.min.js"></script>
<script>
    $(function(){
        $("li").mouseover(function(){
          var  text=$(this).html()
    
   
    
          $(this).css("background-color","orange").siblings().css("background-color","black")
          $(this).parents(".adver").css("background-image",`url("./img/adver0${text}.jpg")`)
        })
    });
</script>
</html>